/*************************************************************************/
/*  path_2d.cpp                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "path_2d.h"
#include "scene/scene_string_names.h"

void Path2D::_notification(int p_what) {

	if (p_what==NOTIFICATION_DRAW && curve.is_valid()) {
		//draw the curve!!

		if (!get_tree()->is_editor_hint() && !get_tree()->is_debugging_navigation_hint()) {
			return;
		}

		for(int i=0;i<curve->get_point_count();i++) {

			Vector2 prev_p=curve->get_point_pos(i);

			for(int j=1;j<=8;j++) {

				real_t frac = j/8.0;
				Vector2 p = curve->interpolate(i,frac);
				draw_line(prev_p,p,Color(0.5,0.6,1.0,0.7),2);
				prev_p=p;
			}
		}
	}
}

void Path2D::_curve_changed() {


	if (is_inside_tree() && get_tree()->is_editor_hint())
		update();

}


void Path2D::set_curve(const Ref<Curve2D>& p_curve) {

	if (curve.is_valid()) {
		curve->disconnect("changed",this,"_curve_changed");
	}

	curve=p_curve;

	if (curve.is_valid()) {
		curve->connect("changed",this,"_curve_changed");
	}

	_curve_changed();

}

Ref<Curve2D> Path2D::get_curve() const{

	return curve;
}

void Path2D::_bind_methods() {

	ClassDB::bind_method(_MD("set_curve","curve:Curve2D"),&Path2D::set_curve);
	ClassDB::bind_method(_MD("get_curve:Curve2D","curve"),&Path2D::get_curve);
	ClassDB::bind_method(_MD("_curve_changed"),&Path2D::_curve_changed);

	ADD_PROPERTY( PropertyInfo( Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve2D"), _SCS("set_curve"),_SCS("get_curve"));
}

Path2D::Path2D() {

	set_curve(Ref<Curve2D>( memnew( Curve2D ))); //create one by default
}

/////////////////////////////////////////////////////////////////////////////////


void PathFollow2D::_update_transform() {


	if (!path)
		return;

	Ref<Curve2D> c =path->get_curve();
	if (!c.is_valid())
		return;


	float o = offset;
	if (loop)
		o=Math::fposmod(o,c->get_baked_length());

	Vector2 pos = c->interpolate_baked(o,cubic);

	if (rotate) {

		Vector2 n = (c->interpolate_baked(o+lookahead,cubic)-pos).normalized();
		Vector2 t = -n.tangent();
		pos+=n*h_offset;
		pos+=t*v_offset;

		set_rotation(t.angle());

	} else {

		pos.x+=h_offset;
		pos.y+=v_offset;
	}

	set_position(pos);

}

void PathFollow2D::_notification(int p_what) {


	switch(p_what) {

		case NOTIFICATION_ENTER_TREE: {

			Node *parent=get_parent();
			if (parent) {

				path=parent->cast_to<Path2D>();
				if (path) {
					_update_transform();
				}
			}

		} break;
		case NOTIFICATION_EXIT_TREE: {


			path=NULL;
		} break;
	}

}

void PathFollow2D::set_cubic_interpolation(bool p_enable) {

	cubic=p_enable;
}

bool PathFollow2D::get_cubic_interpolation() const {

	return cubic;
}


bool PathFollow2D::_set(const StringName& p_name, const Variant& p_value) {

	if (p_name==SceneStringNames::get_singleton()->offset) {
		set_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->unit_offset) {
		set_unit_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->rotate) {
		set_rotate(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->v_offset) {
		set_v_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->h_offset) {
		set_h_offset(p_value);
	} else if (String(p_name)=="cubic_interp") {
		set_cubic_interpolation(p_value);
	} else if (String(p_name)=="loop") {
		set_loop(p_value);
	} else if (String(p_name)=="lookahead") {
		set_lookahead(p_value);
	} else
		return false;

	return true;
}

bool PathFollow2D::_get(const StringName& p_name,Variant &r_ret) const{

	if (p_name==SceneStringNames::get_singleton()->offset) {
		r_ret=get_offset();
	} else if (p_name==SceneStringNames::get_singleton()->unit_offset) {
		r_ret=get_unit_offset();
	} else if (p_name==SceneStringNames::get_singleton()->rotate) {
		r_ret=is_rotating();
	} else if (p_name==SceneStringNames::get_singleton()->v_offset) {
		r_ret=get_v_offset();
	} else if (p_name==SceneStringNames::get_singleton()->h_offset) {
		r_ret=get_h_offset();
	} else if (String(p_name)=="cubic_interp") {
		r_ret=cubic;
	} else if (String(p_name)=="loop") {
		r_ret=loop;
	} else if (String(p_name)=="lookahead") {
		r_ret=lookahead;
	} else
		return false;

	return true;

}
void PathFollow2D::_get_property_list( List<PropertyInfo> *p_list) const{

	float max=10000;
	if (path && path->get_curve().is_valid())
		max=path->get_curve()->get_baked_length();
	p_list->push_back( PropertyInfo( Variant::REAL, "offset", PROPERTY_HINT_RANGE,"0,"+rtos(max)+",0.01"));
	p_list->push_back( PropertyInfo( Variant::REAL, "unit_offset", PROPERTY_HINT_RANGE,"0,1,0.0001",PROPERTY_USAGE_EDITOR));
	p_list->push_back( PropertyInfo( Variant::REAL, "h_offset") );
	p_list->push_back( PropertyInfo( Variant::REAL, "v_offset") );
	p_list->push_back( PropertyInfo( Variant::BOOL, "rotate") );
	p_list->push_back( PropertyInfo( Variant::BOOL, "cubic_interp"));
	p_list->push_back( PropertyInfo( Variant::BOOL, "loop"));
	p_list->push_back( PropertyInfo( Variant::REAL, "lookahead",PROPERTY_HINT_RANGE,"0.001,1024.0,0.001"));
}


String PathFollow2D::get_configuration_warning() const {

	if (!is_visible() || !is_inside_tree())
		return String();

	if (!get_parent() || !get_parent()->cast_to<Path2D>()) {
		return TTR("PathFollow2D only works when set as a child of a Path2D node.");
	}

	return String();

}

void PathFollow2D::_bind_methods() {

	ClassDB::bind_method(_MD("set_offset","offset"),&PathFollow2D::set_offset);
	ClassDB::bind_method(_MD("get_offset"),&PathFollow2D::get_offset);

	ClassDB::bind_method(_MD("set_h_offset","h_offset"),&PathFollow2D::set_h_offset);
	ClassDB::bind_method(_MD("get_h_offset"),&PathFollow2D::get_h_offset);

	ClassDB::bind_method(_MD("set_v_offset","v_offset"),&PathFollow2D::set_v_offset);
	ClassDB::bind_method(_MD("get_v_offset"),&PathFollow2D::get_v_offset);

	ClassDB::bind_method(_MD("set_unit_offset","unit_offset"),&PathFollow2D::set_unit_offset);
	ClassDB::bind_method(_MD("get_unit_offset"),&PathFollow2D::get_unit_offset);

	ClassDB::bind_method(_MD("set_rotate","enable"),&PathFollow2D::set_rotate);
	ClassDB::bind_method(_MD("is_rotating"),&PathFollow2D::is_rotating);

	ClassDB::bind_method(_MD("set_cubic_interpolation","enable"),&PathFollow2D::set_cubic_interpolation);
	ClassDB::bind_method(_MD("get_cubic_interpolation"),&PathFollow2D::get_cubic_interpolation);

	ClassDB::bind_method(_MD("set_loop","loop"),&PathFollow2D::set_loop);
	ClassDB::bind_method(_MD("has_loop"),&PathFollow2D::has_loop);


}

void PathFollow2D::set_offset(float p_offset) {

	offset=p_offset;
	if (path)
		_update_transform();
	_change_notify("offset");
	_change_notify("unit_offset");

}

void PathFollow2D::set_h_offset(float p_h_offset) {

	h_offset=p_h_offset;
	if (path)
		_update_transform();

}

float PathFollow2D::get_h_offset() const {

	return h_offset;
}

void PathFollow2D::set_v_offset(float p_v_offset) {

	v_offset=p_v_offset;
	if (path)
		_update_transform();

}

float PathFollow2D::get_v_offset() const {

	return v_offset;
}


float PathFollow2D::get_offset() const{

	return offset;
}

void PathFollow2D::set_unit_offset(float p_unit_offset) {

	if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
		set_offset(p_unit_offset*path->get_curve()->get_baked_length());

}

float PathFollow2D::get_unit_offset() const{

	if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
		return get_offset()/path->get_curve()->get_baked_length();
	else
		return 0;
}

void PathFollow2D::set_lookahead(float p_lookahead) {

	lookahead=p_lookahead;

}

float PathFollow2D::get_lookahead() const{

	return lookahead;
}

void PathFollow2D::set_rotate(bool p_rotate) {

	rotate=p_rotate;
	_update_transform();
}

bool PathFollow2D::is_rotating() const {

	return rotate;
}

void PathFollow2D::set_loop(bool p_loop) {

	loop=p_loop;
}

bool PathFollow2D::has_loop() const{

	return loop;
}


PathFollow2D::PathFollow2D() {

	offset=0;
	h_offset=0;
	v_offset=0;
	path=NULL;
	rotate=true;
	cubic=true;
	loop=true;
	lookahead=4;
}
